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In order to flush the radiator on my 1996 Safari I had to remove the radiator fan cover under the hood (there are 6 bolts holding it in place). You will find a plug on the bottom of the radiator that has to be unscrewed and the old water will drain. I ususally put a hose in the cap and let the engine run (with the heater on) to flush out all the old fluid. Then re-plug the radiator, re-install the fan cover and re-fill with fresh fluid.

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Q: How do you flush the radiator of a '99 gmc safari?
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